Materiały źródłowe

• #1 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Color blindness is usually a sex-linked inherited problem or variation in the functionality of one or more of the three classes of cone cells in the retina, which mediate color vision. […] The most common form is caused by a genetic condition called congenital redgreen color blindness (including protan and deutan types), which affects up to 1 in 12 males (8%) and 1 in 200 females (0.5%). […] Rarer genetic conditions causing color blindness include congenital blueyellow color blindness (tritan type), blue cone monochromacy, and achromatopsia. […] Color blindness can also result from physical or chemical damage to the eye, the optic nerve, parts of the brain, or from medication toxicity. […] Color vision deficiencies can be classified as inherited or acquired. […] Inherited or congenital/genetic color vision deficiencies are most commonly caused by mutations of the genes encoding opsin proteins.

• #2

• #2 Color blindness – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/color-blindness/symptoms-causes/syc-20354988

  Color blindness is usually inherited, meaning it’s passed down through families. Men are more likely to be born with color blindness. […] Certain eye diseases and some medicines also can cause color blindness. […] If your cones don’t work properly, you will be unable to distinguish the colors red, green or blue. […] Color blindness can be caused by trauma to the eye as a result of injury, surgery, radiation therapy or laser treatment.

• #3 About Colour Blindness – Colour Blind Awareness

  https://www.colourblindawareness.org/colour-blindness/

  Colour (color) blindness (colour vision deficiency, or CVD) affects approximately 1 in 12 men (8%) and 1 in 200 women. […] There are different causes of colour blindness. For most colour blind people their condition is genetic, usually inherited from their mother, although some people become colour blind as a result of other diseases such as diabetes and multiple sclerosis or it can be acquired due to ageing or from taking drugs and medications. […] Problems can arise across the entire colour spectrum potentially affecting perception of all reds, greens, oranges, browns, purples, pinks and greys. Even black can be confused as dark red, dark green or dark blue/purple. […] Find out more about the causes of colour blindness.

• #4 Why Men Are More Likely To Be Colorblind | Henry Ford Health – Detroit, MI

  https://www.henryford.com/blog/2024/10/why-men-are-more-likely-to-be-colorblind

  Color vision deficiency (CVD), commonly called colorblindness, is much more common in males than females. Inherited colorblindness affects 1 in 12 men and 1 in 200 women, but many people don’t know why there’s such a significant difference. Most cases of CVD are caused by a genetic mutation that affects the cone cells in the eye. The gene that causes CVD is on the X chromosome, and it’s a recessive trait. Males only have one X chromosome, so they can’t override the gene variant. Males can get the CVD gene variant from just one parent. Acquired color vision deficiency can occur if a disease affects your retina or changes how your brain processes colors. Possible causes of acquired colorblindness include age-related macular degeneration (AMD), Alzheimer’s disease, cataracts, diabetes, glaucoma, medications, nutritional deficiencies, Parkinson’s disease, retinal detachment, sickle cell disease, and tumors in the brain or eye. […] Inherited CVD isn’t a health problem—it’s just a variation of normal vision.

• #5 Color Blindness: Types, Causes, Symptoms, and Treatment of Color Blindness

  https://www.allaboutvision.com/conditions/color-blindness/color-deficiency/

  Leber’s hereditary optic neuropathy (LHON). This type of inherited optic neuropathy can affect even carriers who don’t have other symptoms but do have a degree of color blindness. […] Kallman’s syndrome. This inherited condition involves failure of the pituitary gland, which can lead to incomplete or unusual gender-related development such as of sexual organs. Color blindness can be one symptom of this condition. […] Color blindness also can occur when aging processes damage retinal cells. An injury or damage to areas of the brain where vision processing takes place also can cause color vision deficiencies. […] Red-green color blindness is the most common inherited form of color vision deficiency. It is caused by a fairly common X-linked recessive gene. […] If you have red-green color blindness caused by an X-linked recessive gene, your mother will be a carrier of the gene or be color deficient herself.

• #6 Color Blindness: Types, Causes, Symptoms, and Treatment of Color Blindness

  https://www.allaboutvision.com/conditions/color-blindness/color-deficiency/

  Fathers with this inherited form of red-green color blindness pass the X-linked gene to their daughters but not to their sons, because a son cannot receive X-linked genetic material from his father. […] A daughter who inherits the color-deficient gene from her father will be a carrier of the gene but she will not be colorblind unless her mother carries the gene, and she receives a paired color-deficient gene from her mother as well. […] When a mother passes along this X-linked trait to her son, he will inherit the color vision deficiency and have trouble distinguishing reds and greens.

• #7 What Causes Color Blindness? | Nationwide Vision

  https://www.nationwidevision.com/eye-care-resources/eye-health/what-causes-color-blindness

  About 300 million people worldwide are color blind, about the same as the number of people who live in the U.S. The condition affects males more frequently, with about 1 in 12 men in the world being color blind. About 1 in 200 women are color blind. Color blindness is most often passed down through genetics, but other conditions can also lead to being color blind. […] In most cases, color blindness is a genetic condition passed down by parents through chromosomes. Red/green color blindness is more common in males. That’s because it is passed down on the X chromosome, which males have only one copy of, while females have two. […] If the one copy passed along by the mother is damaged, then a male will have red/green color blindness. However, females need to have color blindness passed down to them in both X chromosomes, the one from the mother and the one from the father, to inherit it.

• #8 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Color blindness is usually a sex-linked inherited problem or variation in the functionality of one or more of the three classes of cone cells in the retina, which mediate color vision. […] The most common form is caused by a genetic condition called congenital redgreen color blindness (including protan and deutan types), which affects up to 1 in 12 males (8%) and 1 in 200 females (0.5%). […] Rarer genetic conditions causing color blindness include congenital blueyellow color blindness (tritan type), blue cone monochromacy, and achromatopsia. […] Color blindness can also result from physical or chemical damage to the eye, the optic nerve, parts of the brain, or from medication toxicity. […] Color vision deficiencies can be classified as inherited or acquired. […] Inherited or congenital/genetic color vision deficiencies are most commonly caused by mutations of the genes encoding opsin proteins.

• #9 Color vision deficiency: MedlinePlus GeneticsLock

  https://medlineplus.gov/genetics/condition/color-vision-deficiency/

  Color vision deficiency (sometimes called color blindness) represents a group of conditions that affect the perception of color. […] Mutations in the OPN1LW, OPN1MW, and OPN1SW genes cause the forms of color vision deficiency described above. […] Genetic changes involving the OPN1LW or OPN1MW gene cause red-green color vision defects. […] Blue-yellow color vision defects result from mutations in the OPN1SW gene. […] Blue cone monochromacy occurs when genetic changes affecting the OPN1LW and OPN1MW genes prevent both L and M cones from functioning normally. […] Some problems with color vision are not caused by gene mutations. These nonhereditary conditions are described as acquired color vision deficiencies.

• #10 COLOR BLINDNESS: CAUSES, TYPES, SYMPTOMS, TREATMENT AND MORE | Mya Care

  https://myacare.com/blog/color-blindness-causes-types-symptoms-treatment-and-more

  A genetic alteration that impacts the light-sensing cells in the retina of the eye is usually the cause of color blindness. These cells, called cones, are in charge of perceiving and interpreting various colors. […] Inherited color blindness is passed down from parents who carry the genes for it on the X chromosome. Color vision deficiency genes include: CNGA3, CNGB3, GNAT2, OPN1LW, OPN1MW, ATF6, PDE6H, and PDE6C. […] Acquired color blindness can be caused by medications or eye diseases. The exact mechanisms of acquired color deficiencies are not fully understood. It is thought that medications and eye diseases can affect how color-sensitive cones in the eyes work, causing color vision deficiency. […] Health conditions associated with acquired color blindness include: optic nerve neuropathy, age-related macular degeneration, cataracts, glaucoma, diabetic retinopathy, retinitis pigmentosa, macular edema, uveitis, retinal detachment, optic neuritis, eye injuries, brain tumors, and neurological diseases like Alzheimer’s disease, Parkinson’s disease, and multiple sclerosis. […] Medications that cause temporary color vision deficiency include Viagra (sildenafil), amiodarone, chloroquine, digoxin, ethambutol, isotretinoin, phenazopyridine, quinine, sulfasalazine, and tamoxifen.

• #11 Causes of Colour Blindness – Colour Blind Awareness

  https://www.colourblindawareness.org/colour-blindness/causes-of-colour-blindness/

  Colour blindness is usually a genetic (hereditary) condition (you are born with it). Red/green and blue/yellow colour blindness types are usually passed down from your parents. […] The exact physical causes of colour blindness are still being researched, but colour blindness is usually caused by changes to the genetic code sequencing which result in faulty electrical signals being sent to the brain. […] People with normal colour vision have all three types of cone cells/electrical pathways working correctly, but colour blindness occurs when one or more of the cone cell types have abnormal sequencing.

• #12 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Acquired color blindness that is not present at birth may be caused by chronic illness, accidents, medication, chemical exposure or simply normal aging processes. […] Color blindness is typically an inherited genetic disorder. […] The most common forms of color blindness are associated with the Photopsin genes, but the mapping of the human genome has shown there are many causative mutations that do not directly affect the opsins. […] Congenital redgreen color blindness (Daltonism) includes protanopia/protanomaly and deuteranopia/deuteranomaly. […] These conditions are mediated by the OPN1LW and OPN1MW genes, respectively, both on the X chromosome. […] Congenital blueyellow color blindness is a much rarer form of color blindness including tritanopia/tritanomaly. […] Several inherited diseases are known to cause color blindness, including achromatopsia, cone dystrophy, Leber’s congenital amaurosis and retinitis pigmentosa. […] Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. […] Color blindness may be a side effect of prescription drug use.

• #13 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Color blindness is usually a sex-linked inherited problem or variation in the functionality of one or more of the three classes of cone cells in the retina, which mediate color vision. […] The most common form is caused by a genetic condition called congenital redgreen color blindness (including protan and deutan types), which affects up to 1 in 12 males (8%) and 1 in 200 females (0.5%). […] Rarer genetic conditions causing color blindness include congenital blueyellow color blindness (tritan type), blue cone monochromacy, and achromatopsia. […] Color blindness can also result from physical or chemical damage to the eye, the optic nerve, parts of the brain, or from medication toxicity. […] Color vision deficiencies can be classified as inherited or acquired. […] Inherited or congenital/genetic color vision deficiencies are most commonly caused by mutations of the genes encoding opsin proteins.

• #14 Deuteranopia: Red-Green Color Blindness

  https://www.healthline.com/health/deuteranopia

  Red-green color blindness is the most common type of color deficiency. Also known as deuteranopia, this is most likely a congenital condition, meaning that you’re born with it. […] Deuteranopia is a type of red-green color blindness characterized by the inability to distinguish red and green pigments. Protanopia is another type of red-green color deficiency. Both are primarily caused by recessive genes in the X chromosome. […] Red-green color blindness is typically caused by genetic mutations. […] Color blindness occurs when there are genetic deficiencies with one or more of the three cones: L, M, and S. […] Red-green color vision deficiencies occur when there are defects with the OPN1LW (red pigment cone) and OPN1MW (green pigment) genes. These affect the way that color wavelengths are detected by the cones in your retina.

• #15 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Acquired color blindness that is not present at birth may be caused by chronic illness, accidents, medication, chemical exposure or simply normal aging processes. […] Color blindness is typically an inherited genetic disorder. […] The most common forms of color blindness are associated with the Photopsin genes, but the mapping of the human genome has shown there are many causative mutations that do not directly affect the opsins. […] Congenital redgreen color blindness (Daltonism) includes protanopia/protanomaly and deuteranopia/deuteranomaly. […] These conditions are mediated by the OPN1LW and OPN1MW genes, respectively, both on the X chromosome. […] Congenital blueyellow color blindness is a much rarer form of color blindness including tritanopia/tritanomaly. […] Several inherited diseases are known to cause color blindness, including achromatopsia, cone dystrophy, Leber’s congenital amaurosis and retinitis pigmentosa. […] Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. […] Color blindness may be a side effect of prescription drug use.

• #16 What Causes Color-Blindness? – Optometrists.org

  https://www.optometrists.org/vision-therapy/vision-therapy-for-children/checklist-for-parents-2/why-is-my-child-colorblind/what-causes-color-blindness/

  Up to 10 percent of the male population has some degree of abnormal color vision. […] Color vision deficiencies are either inherited or acquired. […] The majority of cases are hereditary; however retinal or optic nerve pathologies such as multiple sclerosis and diabetes can also cause color abnormalities. […] Any hereditary or acquired deficiency in the cones will cause a color vision loss. […] When, to some degree, CVD is hereditary, one of the three types of cones is either not functional or missing. […] Although there is some overlap, there are two main types of hereditary CVDs: difficulty distinguishing reds from greens, and difficulty distinguishing blues from yellows. […] The red-green kind of CVD is significantly more frequent than the blue-yellow type. […] Blue-yellow CVD is a rare type of CVD. This type of CVD is not only rarer, but also more severe, because patients with it frequently have some red-green deficiency as well.

• #17 What Causes Color Blindness? | Nationwide Vision

  https://www.nationwidevision.com/eye-care-resources/eye-health/what-causes-color-blindness

  Other varieties of the condition, such as blue/yellow color blindness, impact females and males equally. These are passed down in different sets of chromosomes. […] Genetics are not the only cause of color blindness. Color blindness can be secondary to other diseases, such as injuries to the eye or brain, eye conditions such as glaucoma or macular degeneration, the result of vascular disease, neurological conditions such as multiple sclerosis or Alzheimer’s, side effects from certain medications, and development of cataracts.

• #18 Causes & incidence | Causes of Color

  https://www.webexhibits.org/causesofcolor/2C.html

  Protanomaly and deutanomaly (sometimes referred to as red-green colorblindness) are caused by anomalies in the X chromosome. Since women have two X chromosomes while men have an X chromosome and a Y chromosome, this colorblindness is much more common in men; women must have defects in both chromosomes before they exhibit this colorblindness. However, because the gene is recessive, a woman who is not colorblind, but has a colorblindness defect in one X chromosome, is a carrier of this colorblindness. […] Tritanomaly is found equally in men and women. The gene coding for the blue receptors lie on a chromosome that is found equally in men and women. It is believed that the colorblindness is caused by a simple mutation of the gene.

• #19 Achromatopsia: Color Blindness and Other Vision Issues

  https://my.clevelandclinic.org/health/diseases/23909-achromatopsia

  Achromatopsia is a genetic disorder that results from mutations in one of six genes. […] Achromatopsia is an inherited vision disorder that limits your ability to see color. […] In color blindness, people have normal vision and see some color. In achromatopsia, vision is reduced, there is a lack of color vision, and other vision issues arise such as rapid eye movements. […] With achromatopsia, the cones don’t function as they should. […] If you have complete achromatopsia, vision depends on rod activity. If you have incomplete achromatopsia, vision is based on rods and some cone functioning. […] Symptoms, such as poor vision and color blindness, may also be present.

• #20 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Acquired color blindness that is not present at birth may be caused by chronic illness, accidents, medication, chemical exposure or simply normal aging processes. […] Color blindness is typically an inherited genetic disorder. […] The most common forms of color blindness are associated with the Photopsin genes, but the mapping of the human genome has shown there are many causative mutations that do not directly affect the opsins. […] Congenital redgreen color blindness (Daltonism) includes protanopia/protanomaly and deuteranopia/deuteranomaly. […] These conditions are mediated by the OPN1LW and OPN1MW genes, respectively, both on the X chromosome. […] Congenital blueyellow color blindness is a much rarer form of color blindness including tritanopia/tritanomaly. […] Several inherited diseases are known to cause color blindness, including achromatopsia, cone dystrophy, Leber’s congenital amaurosis and retinitis pigmentosa. […] Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. […] Color blindness may be a side effect of prescription drug use.

• #21 Colorblindness | Causes of Color

  https://www.webexhibits.org/causesofcolor/2A.html

  Hundreds of millions of people have vision problems. Colorblindness affects as many as 1 in 12 men and 1 in 200 women. Although colorblindness is typically the result of a genetic condition, acquired color deficiencies can stem from injury or disease. […] Total colorblindness is very rare but the effects are severe. L-cone, M-cone, or S-cone monochromacy describes a condition where only one type of cone pigment functions, and thus only a single color is perceived. […] The terms protan, deutan, and tritan are used to refer to the absence of functional L-cone, M-cone, and S-cone pigments, respectively.

• #22 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Acquired color blindness that is not present at birth may be caused by chronic illness, accidents, medication, chemical exposure or simply normal aging processes. […] Color blindness is typically an inherited genetic disorder. […] The most common forms of color blindness are associated with the Photopsin genes, but the mapping of the human genome has shown there are many causative mutations that do not directly affect the opsins. […] Congenital redgreen color blindness (Daltonism) includes protanopia/protanomaly and deuteranopia/deuteranomaly. […] These conditions are mediated by the OPN1LW and OPN1MW genes, respectively, both on the X chromosome. […] Congenital blueyellow color blindness is a much rarer form of color blindness including tritanopia/tritanomaly. […] Several inherited diseases are known to cause color blindness, including achromatopsia, cone dystrophy, Leber’s congenital amaurosis and retinitis pigmentosa. […] Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. […] Color blindness may be a side effect of prescription drug use.

• #23 Can a person develop color blindness later in life?

  https://www.medicalnewstoday.com/articles/can-you-develop-color-blindness

  Most individuals with color vision deficiency have had it since birth. […] However, various health problems can damage either the cone receptors or the part of the brain that interprets color, meaning color vision deficiency may develop later on. Doctors refer to this as acquired color vision deficiency. […] Acquired color vision deficiency can occur as a result of damage to the eye or the area of the brain that interprets color. The following causes may contribute: eye diseases, such as age-related macular degeneration (AMD), retinitis pigmentosa, or glaucoma; nervous system and brain diseases, including multiple sclerosis (MS), some strokes, and Alzheimers disease; other chronic diseases, such as type 2 diabetes, liver disease, chronic alcohol use disorder, and sickle cell anemia; injuries, such as those from trauma or tumors; aging, as being over 70 years of age can lead to declining color vision; exposure to industrial toxins, including carbon monoxide, carbon disulfide, and lead; medication side effects, including some antibiotics, barbiturates, drugs to treat tuberculosis, medications for high blood pressure, and those to manage some nervous system disorders. […] Inherited color vision deficiency is more common than the acquired type that can develop later in life. However, people can acquire color vision deficiency later in life due to injury, illness, medication side effects, aging, or exposure to toxins in their environment.

• #24

  https://www.aao.org/eye-health/diseases/color-blindness-causes

  Most people with color blindness are born with it. (This is called a congenital condition.) Congenital color vision defects usually pass from mother to son. […] These defects are due to partial or complete lack of light-sensitive photoreceptors (cones) in the retina, which is the layer of light-sensitive nerve cells lining the back of the eye. Cones help you to distinguish the colors red, green, and blue. […] Most color vision problems that occur later in life are a result of disease, trauma, toxic effects from drugs, metabolic disease or vascular disease. Color vision defects from disease are less understood than congenital color vision problems. Disease-specific color blindness often affects both eyes differently, and the color vision defect usually gets worse over time. Acquired color vision loss can be the result of damage to the retina or optic nerve.

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• #26 Color blindness – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/poor-color-vision/symptoms-causes/syc-20354988

  Color blindness is usually inherited, meaning it’s passed down through families. Men are more likely to be born with color blindness. […] Certain eye diseases and some medicines also can cause color blindness. […] If your cones don’t work properly, you will be unable to distinguish the colors red, green or blue. […] Some conditions that can increase the risk of color deficiency include sickle cell anemia, diabetes, macular degeneration, Alzheimer’s disease, multiple sclerosis, glaucoma, Parkinson’s disease, chronic alcoholism and leukemia. […] Color blindness can be caused by trauma to the eye as a result of injury, surgery, radiation therapy or laser treatment.

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• #28 Color blindness – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/poor-color-vision/symptoms-causes/syc-20354988

  Color blindness is usually inherited, meaning it’s passed down through families. Men are more likely to be born with color blindness. […] Certain eye diseases and some medicines also can cause color blindness. […] If your cones don’t work properly, you will be unable to distinguish the colors red, green or blue. […] Some conditions that can increase the risk of color deficiency include sickle cell anemia, diabetes, macular degeneration, Alzheimer’s disease, multiple sclerosis, glaucoma, Parkinson’s disease, chronic alcoholism and leukemia. […] Color blindness can be caused by trauma to the eye as a result of injury, surgery, radiation therapy or laser treatment.

• #29 Content – Health Encyclopedia – University of Rochester Medical Center

  https://www.urmc.rochester.edu/encyclopedia/content?contenttypeid=134&contentid=526

  In rare cases, color blindness can be caused by a health condition instead of being present from birth. These include: Optic neuritis, Macular degeneration, Glaucoma, Diabetic retinopathy, Multiple sclerosis, Parkinson disease, Alzheimer disease, Other diseases that affect the optic nerve or retina, Diseases that affect the lens of the eye, Toxic effects from medicines, Stroke, especially in the occipital lobe, Chronic alcoholism, Leukemia, Sickle cell anemia.

• #30 Content – Health Encyclopedia – University of Rochester Medical Center

  https://www.urmc.rochester.edu/encyclopedia/content?contenttypeid=134&contentid=526

  In rare cases, color blindness can be caused by a health condition instead of being present from birth. These include: Optic neuritis, Macular degeneration, Glaucoma, Diabetic retinopathy, Multiple sclerosis, Parkinson disease, Alzheimer disease, Other diseases that affect the optic nerve or retina, Diseases that affect the lens of the eye, Toxic effects from medicines, Stroke, especially in the occipital lobe, Chronic alcoholism, Leukemia, Sickle cell anemia.

• #31 What Causes Color-Blindness? – Optometrists.org

  https://www.optometrists.org/vision-therapy/vision-therapy-for-children/checklist-for-parents-2/why-is-my-child-colorblind/what-causes-color-blindness/

  There are many causes for acquired color vision deficiency. Among them are: Alzheimers disease, Chronic alcoholism, Diabetes, Glaucoma, Leukemia, Macular degeneration, Multiple sclerosis, Parkinsons disease, Sickle cell anemia. […] Furthermore, some medications, such as those used to treat heart problems, high blood pressure, infections, and psychological issues, might cause color vision distortion.

• #32 Colour vision deficiency (colour blindness) | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/colour-blindness

  Colour blindness is usually inherited and affects more boys than girls. […] Colour blindness is caused by a lack of particular colour-sensitive cells in the back of the eye. […] Colour vision deficiency is most commonly a genetic condition. It occurs due to a change in one (or more) of three genes that are involved in the production of visual photopigments (known as opsins). […] Colour vision problems can also arise later in life due to disease, trauma or exposure to toxins. […] Colour vision deficiency is not always inherited. It can also be due to other causes, including: a chromosomal change during early development, trauma that causes brain or retinal damage, disease such as degenerative eye disease (for example, macular degeneration, glaucoma and retinitis pigmentosa), diabetes, Alzheimers disease, leukaemia, liver disease, chronic alcoholism, multiple sclerosis, Parkinsons disease and sickle cell anaemia, exposure to toxins.

• #33 Color blindness Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/diseases-conditions/color-blindness

  Color blindness occurs when there is a problem with the pigments in certain nerve cells of the eye that sense color. These cells are called cones. They are found in the light-sensitive layer of tissue at the back of the eye, called the retina. […] Most color blindness is due to a genetic problem. About 1 in 10 men have some form of color blindness. Very few women are color blind. […] The drug hydroxychloroquine (Plaquenil) can also cause color blindness. It is used to treat rheumatoid arthritis and other conditions.

• #34 What Causes Color Blindness: Prevalence, Symptoms, Types & More

  https://www.healthline.com/health/color-blindness

  If one or more of these cones in your retina is damaged or isn’t present, you’ll have difficulty seeing colors properly. […] Certain medications can cause changes in color vision. […] Color blindness may also be due to other factors. One factor is aging. Vision loss and color deficiency can happen gradually with age. Additionally, toxic chemicals such as styrene, which is present in some plastics, are linked to the loss of ability to see color.

• #35 COLOR BLINDNESS: CAUSES, TYPES, SYMPTOMS, TREATMENT AND MORE | Mya Care

  https://myacare.com/blog/color-blindness-causes-types-symptoms-treatment-and-more

  A genetic alteration that impacts the light-sensing cells in the retina of the eye is usually the cause of color blindness. These cells, called cones, are in charge of perceiving and interpreting various colors. […] Inherited color blindness is passed down from parents who carry the genes for it on the X chromosome. Color vision deficiency genes include: CNGA3, CNGB3, GNAT2, OPN1LW, OPN1MW, ATF6, PDE6H, and PDE6C. […] Acquired color blindness can be caused by medications or eye diseases. The exact mechanisms of acquired color deficiencies are not fully understood. It is thought that medications and eye diseases can affect how color-sensitive cones in the eyes work, causing color vision deficiency. […] Health conditions associated with acquired color blindness include: optic nerve neuropathy, age-related macular degeneration, cataracts, glaucoma, diabetic retinopathy, retinitis pigmentosa, macular edema, uveitis, retinal detachment, optic neuritis, eye injuries, brain tumors, and neurological diseases like Alzheimer’s disease, Parkinson’s disease, and multiple sclerosis. […] Medications that cause temporary color vision deficiency include Viagra (sildenafil), amiodarone, chloroquine, digoxin, ethambutol, isotretinoin, phenazopyridine, quinine, sulfasalazine, and tamoxifen.

• #36 What causes color blindness?

  https://enchroma.com/pages/what-causes-color-blindness

  The most common types of color blindness are the red-green types which are also called protan („pro-tan”) color blindness and deutan (do-tan) color blindness. Red-green color blindness is an inherited condition caused by recessive genes on the X-chromosome. These genes cause a molecular substitution to be expressed in the retinal photopigment molecule, which in turn, causes its spectral absorption to be shifted in such a way that the available information is reduced. […] Color blindness and color vision deficiency can also be caused by natural aging processes in the eye, and by low vision disorders such as glaucoma, cataracts, and macular degeneration, as well as metabolic and vascular diseases. […] Color vision loss can also be a side effect of drugs, or a result from exposure to neuro-toxic chemicals such as styrene, perchloroethylene, toluene, carbon disulfide, n-hexane, and mercury.

• #37 Color Blindness | National Eye Institute

  https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness

  Most people who have color vision deficiency are born with it. This is because the most common types of color vision deficiency are genetic, meaning theyre passed down from parents. […] Color vision deficiency can also happen because of an injury to the retina (the light-sensitive layer of tissue in the back of the eye), the optic nerve (which connects the eye to the brain), or the brain itself. Some examples of injuries that can lead to color vision deficiency are: […] Color vision may also get worse as you get older often because of cataracts (cloudy areas in the lens of the eye).

• #38 Color blindness – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/color-blindness/symptoms-causes/syc-20354988

  Color blindness is usually inherited, meaning it’s passed down through families. Men are more likely to be born with color blindness. […] Certain eye diseases and some medicines also can cause color blindness. […] If your cones don’t work properly, you will be unable to distinguish the colors red, green or blue. […] Color blindness can be caused by trauma to the eye as a result of injury, surgery, radiation therapy or laser treatment.

• #39 Color blindness – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/color-blindness/symptoms-causes/syc-20354988

  Color blindness is usually inherited, meaning it’s passed down through families. Men are more likely to be born with color blindness. […] Certain eye diseases and some medicines also can cause color blindness. […] If your cones don’t work properly, you will be unable to distinguish the colors red, green or blue. […] Color blindness can be caused by trauma to the eye as a result of injury, surgery, radiation therapy or laser treatment.

• #40 Color Blindness | National Eye Institute

  https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness

  Most people who have color vision deficiency are born with it. This is because the most common types of color vision deficiency are genetic, meaning theyre passed down from parents. […] Color vision deficiency can also happen because of an injury to the retina (the light-sensitive layer of tissue in the back of the eye), the optic nerve (which connects the eye to the brain), or the brain itself. Some examples of injuries that can lead to color vision deficiency are: […] Color vision may also get worse as you get older often because of cataracts (cloudy areas in the lens of the eye).

• #41 What Causes Color Blindness: Prevalence, Symptoms, Types & More

  https://www.healthline.com/health/color-blindness

  If one or more of these cones in your retina is damaged or isn’t present, you’ll have difficulty seeing colors properly. […] Certain medications can cause changes in color vision. […] Color blindness may also be due to other factors. One factor is aging. Vision loss and color deficiency can happen gradually with age. Additionally, toxic chemicals such as styrene, which is present in some plastics, are linked to the loss of ability to see color.

• #42 Color Blindness Causes and Coping Strategies

  https://www.ophthalmology24.com/color-blindness-causes-and-coping

  Acquired color blindness means the cause is external. It can result from various factors, including aging, diseases, medications, and chemical exposure. […] As people age, the lens of the eye turns more yellow (cataract), affecting color perception. Diabetes, glaucoma, macular degeneration, and optic nerve diseases can impair color vision, too. […] Medications for heart problems, high blood pressure, and infections can also cause color vision changes. Last but not least, exposure to chemicals like carbon disulfide and styrene may affect color vision.

• #43 What Causes Color Blindness: Prevalence, Symptoms, Types & More

  https://www.healthline.com/health/color-blindness

  Color blindness occurs when problems with the color-sensing pigments in the eye cause a difficulty or an inability to distinguish colors. […] Color blindness can either be inherited or acquired. […] Inherited color blindness is more common. Its due to a genetic defect. This means that the condition passes down through the family. […] The majority of color vision deficiency is inherited. It typically passes from mother to son. Inherited color blindness doesn’t cause blindness or other vision loss. […] You can also have color blindness as a result of disease or injury to your retina. […] Diseases that damage the optic nerve or the retina of the eye can cause acquired color blindness. […] The eye contains nerve cells called cones that enable the retina, a light-sensitive layer of tissue in the back of your eye, to see colors.

• #44 Red-green color deficiency, red-green color blindness and total color blindness

  https://www.zeiss.com/vision-care/us/eye-health-and-care/understanding-vision/red-green-color-deficiency-color-blindness.html

  The retina of the human eye consists of two types of sensory cells: rods and cones. Rods primarily help us see bright-dark contrasts, while cones are responsible for color vision. People with normal vision have three different types of cones, each of which is responsible for a certain color range: L cones for red, S cones for blue and M cones for green. […] If a type of cone does not work properly or fails to work at all, then this limits the person’s ability to perceive colors, causing a color impairment or color blindness. […] People with a color deficiency only perceive certain colors and not others because one part of their receptors the cones do not work properly. […] The most common is the red-green color deficiency, which people often (incorrectly) refer to as red-green color blindness or just color blindness.

• #45 Causes of Colour Blindness – Colour Blind Awareness

  https://www.colourblindawareness.org/colour-blindness/causes-of-colour-blindness/

  Colour blindness is usually a genetic (hereditary) condition (you are born with it). Red/green and blue/yellow colour blindness types are usually passed down from your parents. […] The exact physical causes of colour blindness are still being researched, but colour blindness is usually caused by changes to the genetic code sequencing which result in faulty electrical signals being sent to the brain. […] People with normal colour vision have all three types of cone cells/electrical pathways working correctly, but colour blindness occurs when one or more of the cone cell types have abnormal sequencing.

• #46 What Causes Color Blindness: Prevalence, Symptoms, Types & More

  https://www.healthline.com/health/color-blindness

  Color blindness occurs when problems with the color-sensing pigments in the eye cause a difficulty or an inability to distinguish colors. […] Color blindness can either be inherited or acquired. […] Inherited color blindness is more common. Its due to a genetic defect. This means that the condition passes down through the family. […] The majority of color vision deficiency is inherited. It typically passes from mother to son. Inherited color blindness doesn’t cause blindness or other vision loss. […] You can also have color blindness as a result of disease or injury to your retina. […] Diseases that damage the optic nerve or the retina of the eye can cause acquired color blindness. […] The eye contains nerve cells called cones that enable the retina, a light-sensitive layer of tissue in the back of your eye, to see colors.

• #47 Red-green color deficiency, red-green color blindness and total color blindness

  https://www.zeiss.com/vision-care/us/eye-health-and-care/understanding-vision/red-green-color-deficiency-color-blindness.html

  The retina of the human eye consists of two types of sensory cells: rods and cones. Rods primarily help us see bright-dark contrasts, while cones are responsible for color vision. People with normal vision have three different types of cones, each of which is responsible for a certain color range: L cones for red, S cones for blue and M cones for green. […] If a type of cone does not work properly or fails to work at all, then this limits the person’s ability to perceive colors, causing a color impairment or color blindness. […] People with a color deficiency only perceive certain colors and not others because one part of their receptors the cones do not work properly. […] The most common is the red-green color deficiency, which people often (incorrectly) refer to as red-green color blindness or just color blindness.

• #48 Causes of Colour Blindness – Colour Blind Awareness

  https://www.colourblindawareness.org/colour-blindness/causes-of-colour-blindness/

  Colour blindness is usually a genetic (hereditary) condition (you are born with it). Red/green and blue/yellow colour blindness types are usually passed down from your parents. […] The exact physical causes of colour blindness are still being researched, but colour blindness is usually caused by changes to the genetic code sequencing which result in faulty electrical signals being sent to the brain. […] People with normal colour vision have all three types of cone cells/electrical pathways working correctly, but colour blindness occurs when one or more of the cone cell types have abnormal sequencing.

• #49

  https://www.aao.org/eye-health/diseases/color-blindness-causes

• #50 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Acquired color blindness that is not present at birth may be caused by chronic illness, accidents, medication, chemical exposure or simply normal aging processes. […] Color blindness is typically an inherited genetic disorder. […] The most common forms of color blindness are associated with the Photopsin genes, but the mapping of the human genome has shown there are many causative mutations that do not directly affect the opsins. […] Congenital redgreen color blindness (Daltonism) includes protanopia/protanomaly and deuteranopia/deuteranomaly. […] These conditions are mediated by the OPN1LW and OPN1MW genes, respectively, both on the X chromosome. […] Congenital blueyellow color blindness is a much rarer form of color blindness including tritanopia/tritanomaly. […] Several inherited diseases are known to cause color blindness, including achromatopsia, cone dystrophy, Leber’s congenital amaurosis and retinitis pigmentosa. […] Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. […] Color blindness may be a side effect of prescription drug use.

• #51

  https://www.aao.org/eye-health/diseases/color-blindness-causes

  Most people with color blindness are born with it. (This is called a congenital condition.) Congenital color vision defects usually pass from mother to son. […] These defects are due to partial or complete lack of light-sensitive photoreceptors (cones) in the retina, which is the layer of light-sensitive nerve cells lining the back of the eye. Cones help you to distinguish the colors red, green, and blue. […] Most color vision problems that occur later in life are a result of disease, trauma, toxic effects from drugs, metabolic disease or vascular disease. Color vision defects from disease are less understood than congenital color vision problems. Disease-specific color blindness often affects both eyes differently, and the color vision defect usually gets worse over time. Acquired color vision loss can be the result of damage to the retina or optic nerve.

• #52

  https://www.aao.org/eye-health/diseases/color-blindness-causes

  Most people with color blindness are born with it. (This is called a congenital condition.) Congenital color vision defects usually pass from mother to son. […] These defects are due to partial or complete lack of light-sensitive photoreceptors (cones) in the retina, which is the layer of light-sensitive nerve cells lining the back of the eye. Cones help you to distinguish the colors red, green, and blue. […] Most color vision problems that occur later in life are a result of disease, trauma, toxic effects from drugs, metabolic disease or vascular disease. Color vision defects from disease are less understood than congenital color vision problems. Disease-specific color blindness often affects both eyes differently, and the color vision defect usually gets worse over time. Acquired color vision loss can be the result of damage to the retina or optic nerve.

• #53 Color Blindness and Eye Health: Is There a Connection? – Space Coast Ophthalmology

  https://spacecoastophthalmology.com/color-blindness-and-eye-health/

  Unfortunately, color blindness cannot be prevented as it is typically caused by genetic factors or certain medical conditions. Inherited color blindness is caused by gene mutations that cannot be controlled, while acquired color blindness may occur as a result of underlying medical conditions or exposure to certain environmental factors. […] Research has shown a potential link between color blindness and other eye conditions. For example, individuals with certain types of color blindness may be at increased risk for developing age-related macular degeneration (AMD), a condition that causes damage to the retina and can lead to vision loss. […] Additionally, color blindness may also be associated with a higher risk of glaucoma, a group of conditions that damage the optic nerve and can cause irreversible vision loss if left untreated. […] Studies have also suggested a possible connection between color blindness and cataracts, a clouding of the lens in the eye that can cause blurred or dim vision.

• #54 Color Blindness and Eye Health: Is There a Connection? – Space Coast Ophthalmology

  https://spacecoastophthalmology.com/color-blindness-and-eye-health/

  Unfortunately, color blindness cannot be prevented as it is typically caused by genetic factors or certain medical conditions. Inherited color blindness is caused by gene mutations that cannot be controlled, while acquired color blindness may occur as a result of underlying medical conditions or exposure to certain environmental factors. […] Research has shown a potential link between color blindness and other eye conditions. For example, individuals with certain types of color blindness may be at increased risk for developing age-related macular degeneration (AMD), a condition that causes damage to the retina and can lead to vision loss. […] Additionally, color blindness may also be associated with a higher risk of glaucoma, a group of conditions that damage the optic nerve and can cause irreversible vision loss if left untreated. […] Studies have also suggested a possible connection between color blindness and cataracts, a clouding of the lens in the eye that can cause blurred or dim vision.

• #55 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Color blindness is usually a sex-linked inherited problem or variation in the functionality of one or more of the three classes of cone cells in the retina, which mediate color vision. […] The most common form is caused by a genetic condition called congenital redgreen color blindness (including protan and deutan types), which affects up to 1 in 12 males (8%) and 1 in 200 females (0.5%). […] Rarer genetic conditions causing color blindness include congenital blueyellow color blindness (tritan type), blue cone monochromacy, and achromatopsia. […] Color blindness can also result from physical or chemical damage to the eye, the optic nerve, parts of the brain, or from medication toxicity. […] Color vision deficiencies can be classified as inherited or acquired. […] Inherited or congenital/genetic color vision deficiencies are most commonly caused by mutations of the genes encoding opsin proteins.

• #56 Color blindness – Wikipedia

  https://en.wikipedia.org/wiki/Color_blindness

  Acquired color blindness that is not present at birth may be caused by chronic illness, accidents, medication, chemical exposure or simply normal aging processes. […] Color blindness is typically an inherited genetic disorder. […] The most common forms of color blindness are associated with the Photopsin genes, but the mapping of the human genome has shown there are many causative mutations that do not directly affect the opsins. […] Congenital redgreen color blindness (Daltonism) includes protanopia/protanomaly and deuteranopia/deuteranomaly. […] These conditions are mediated by the OPN1LW and OPN1MW genes, respectively, both on the X chromosome. […] Congenital blueyellow color blindness is a much rarer form of color blindness including tritanopia/tritanomaly. […] Several inherited diseases are known to cause color blindness, including achromatopsia, cone dystrophy, Leber’s congenital amaurosis and retinitis pigmentosa. […] Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. […] Color blindness may be a side effect of prescription drug use.

• #57

  https://www.aao.org/eye-health/diseases/color-blindness-causes

  Most people with color blindness are born with it. (This is called a congenital condition.) Congenital color vision defects usually pass from mother to son. […] These defects are due to partial or complete lack of light-sensitive photoreceptors (cones) in the retina, which is the layer of light-sensitive nerve cells lining the back of the eye. Cones help you to distinguish the colors red, green, and blue. […] Most color vision problems that occur later in life are a result of disease, trauma, toxic effects from drugs, metabolic disease or vascular disease. Color vision defects from disease are less understood than congenital color vision problems. Disease-specific color blindness often affects both eyes differently, and the color vision defect usually gets worse over time. Acquired color vision loss can be the result of damage to the retina or optic nerve.

• #58 Can a person develop color blindness later in life?

  https://www.medicalnewstoday.com/articles/can-you-develop-color-blindness

  Most individuals with color vision deficiency have had it since birth. […] However, various health problems can damage either the cone receptors or the part of the brain that interprets color, meaning color vision deficiency may develop later on. Doctors refer to this as acquired color vision deficiency. […] Acquired color vision deficiency can occur as a result of damage to the eye or the area of the brain that interprets color. The following causes may contribute: eye diseases, such as age-related macular degeneration (AMD), retinitis pigmentosa, or glaucoma; nervous system and brain diseases, including multiple sclerosis (MS), some strokes, and Alzheimers disease; other chronic diseases, such as type 2 diabetes, liver disease, chronic alcohol use disorder, and sickle cell anemia; injuries, such as those from trauma or tumors; aging, as being over 70 years of age can lead to declining color vision; exposure to industrial toxins, including carbon monoxide, carbon disulfide, and lead; medication side effects, including some antibiotics, barbiturates, drugs to treat tuberculosis, medications for high blood pressure, and those to manage some nervous system disorders. […] Inherited color vision deficiency is more common than the acquired type that can develop later in life. However, people can acquire color vision deficiency later in life due to injury, illness, medication side effects, aging, or exposure to toxins in their environment.

• #59 Color Blindness: Causes, Types, and Treatments Explained

  https://www.webmd.com/eye-health/ss/slideshow-color-blindness

  Certain drugs — including some that treat heart disease, high blood pressure, erectile dysfunction, nervous ailments, or emotional disorders — can have colorblindness as a side effect. Colorblindness also can come from working around chemicals like fertilizers or solvents. But while things like taking certain drugs or working with certain chemicals can cause secondary color deficiency, it is very uncommon. […] If your colorblindness started because of a disease or is a side effect of prescription medicines, you might be able to do something about it. For example, your doctor might be able to prescribe a different drug. But the main kind of colorblindness, the type you inherit from your parents, cant be corrected. […] Researchers are looking for ways to treat the kind of colorblindness you get through your genes by helping the cones work better. Tests on animals have been promising, and tests on people, called clinical trials, are going on now. Talk with your eye doctor if youre interested in taking part in a trial.

• #60 What Causes Color Blindness?

  https://www.brainandlife.org/articles/people-who-are-color-blind-cant-see-the-full-range

  Color blindness describes various forms of an inherited trait that scientists call color vision deficiency, says Jay Neitz, PhD, professor of ophthalmology at the University of Washington in Seattle. […] Color blindness is shorthand for a more complex process involving the eyes and brain, says Bart Leroy, MD, PhD, director of the ophthalmic genetics and retinal degeneration clinics at the Children’s Hospital of Philadelphia. […] Depending on what type of color vision deficiency a person has, cone cells are either missing or not sufficiently sensitive; the result is that only certain color information is being recognized and sent to the brain, says Dr. Leroy. […] Color vision deficiency is X-linked, meaning genetic mutations associated with the condition are passed along on the X chromosome, says Dr. Leroy. […] Before the 1980s, the „biological basis of color blindness was not understood at all,” says Dr. Neitz, who runs a research lab focused on color blindness with his wife, Maureen Neitz, PhD.

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